Gage for pipe-threading machines



G. P. SMITH.

'l GAGE POR PIPE THREADING MACHINES.

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(No Model.)-

, UNITE STATES l PATENT OFFICE.

GEORGE. E. sMrTrL oE-EEIncE'PoRT, CONNECTICUT.

GAGEFOR' Plii-THREAIJINGV MACHINES.

sPECIFICATroN formi-ng part of "Letters Patent No. 294,518, dated March 4, 1884.

, Application filed February 21, 1883. `(No model.)

T0 a/ZZ whom, it may concern' Be it known that I, GEORGE F. SMITH, o Bridgeport, county of Fairiield, and State of Connecticut, have invented a new and useful Improvement in Gages for Pipe Threading Machines, and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part-of this speciiication.

This invention has reference to a gage .for distancing the cutters of portable pipe-threading machines 5 and the invention consists in a gage having a series of steps of different diametrical distances, such steps being designed to' be inserted between the lcutters of a threading-machine, so that such cutters ymay b e distanced in such manner as to operate upon pipes of different circumferences.

My invention further Consists in the combination, with a pipe-threading machine pro- `vided at the front of its stock with a series of holes, of the gage provided with a series of pins arranged to enter said holes, so as to center the gage between the cutters, all as hereinafter set forth.

Figure l is an end view, partly in section, of the thread-cutting machine, showing the holes in the stoclfront for centering the gage. Fig. 2 is a sectional view of the same; and Fig. 3 is a sectional view ofthe gage, by means of which the cutters are adjusted to the various diameters of pipe.

In the drawings, A is thestock, in which the hand-spikes B B are secured, and by which the stock is turned.

C C are the cutters, secured in radial slots and held by the ring D. The cutters C C are moved inward and outward byineans of screws secured in the stock A and threaded in the cutters, so that by turning the screw-head in one direction the cutters'are moved toward .the center, and when turned in the opposite direction they arel moved outward from the center, and thus the cutters may be adjusted to cut pipes of different diameters.

E is a iianged sleeve consisting of a circular plate or frame, on which projecting pins a c are placed, which iit into the holes c a in the face ofthe stock. The plate is provided with the sleeve e, in which the gage e slides. This gage is provided with the steps e2 e2 of diameters sufficiently less than the pipesto be cut to allow the cutters, when brought in Contact with the step orring e2 designed for a pipe of 55 the desired diameter, to cut a clean and sharp thread. The gage e is providedwith .one or more screws, which'pass through one or more slots, fc3, made'in the'sleeve e, so that the gage can be projected more or less, and (when set 6o against the face of the stock) allow the cutters to be brought in contact with the step or ring e2 corresponding with the pipe which is to be threaded. Vhen the cutters are adjusted, the gage is removed. The stock A is mounted on the sleeve F, and can turn freely on the saine. It can also be secured'to the same by means of the screws f, and turn with the sleeve F. The sleeve F is provided with ascrew-thread of the same pitch 7o as the cutters, and is screwed on the threaded sleeve G, in which the bushing H is secured, which is of such internal diameter that the pipe to be cut will fit the interior 0E the bushing. Bushings tting the pipes to be cut are entered into the sleeve G, and are exchanged when pipes of different diameters are to be cut. They serve to secure the proper position of the' pipe with relation to the cutters. g g are clamp-screws by which the pipe, when insert 8o ed close up to the cutters G C, is secured.

The operation of the machine is as follows: A pipe of any ofthe diameters for which the machine is constructed having to be threaded, the gage e is iirst adjusted, so that when placed on the face of the stock into the holes c c the cutters C C are adjusted to cut the thread of this pipe by being brought in Contact with the step e2 corresponding with 4such pipe. The proper bushing H corresponding with such 9o pipe is now inserted and secured by entering the screws g y into corresponding holes in the bushing. The pipe is now inserted so as to nearly touch the cutters C C, as is shown in broken lines in Fig. 2. 'The stock A is now 95 secured to the threaded sleeve F by the screws fj", and the machine is ready to cut the thread on the pipe. For this purpose it is turned from left to right bymeans of the hand-spikes B B. The cutters are drawn over the end of roo the pipe by the sleeve F turning on the thread of the sleeve G, and thereby feeding the pipe to the cutters, or, more f properly speaking, drawing the cutters over the pipe, assisted by the inclination of thc cutters themselves, for usually the pipe is rmly held in avise. After part of the thread has been cut, the pipe may be released by unscrcwing the screws g g,

and the stock made to rotate independentof the sleeve F by releasing the screws ff. By this arrangement the threading of the pipes is much facilitated, a sharper, better, and cleaner thread is cut, and the labor and difficulty of fairly and squarely starting the thread on the pipe is avoided.

It is to be understood that my improved gage may be applied to any threading-machine of similar form to that here shown and described.

Having thus described my invention, l claim as new and desire to secure by Letters Patentl. An improved device for use in connection with pipe-threading machines, consisting of a gage having a series of steps of different diametrical distances, arranged to be inserted between the thread-cutters and to distance the same for operation upon pipes of different 'cireumferences, substantiallyl as described.

2. The combination, with a thread-cutting machine constructed and operating substantially as herein described, and having its stockfront provided with a series of holes, of a gage consisting of a cylinder provided withaseries of steps of different diameters, and asupporting-cylinder for said gage provided with a series of pins or projections arranged to enter the holes of the stock-front, substantially as described.

3. |lhe combination, with the threading-machine herein described and its stock A, provided with the holes a, of the gage e', provided with the steps c2, and the supporting-cylinder E, provided with the pins a and slots c", and a series of adjusting-pins passing through said slots and into the said gage, as set forth.

GEORGE F. SMITH.

- XVitnesses:

JNO. E. GRAHAM, WM. W. PRITCHETT. 

